Beyond the medical field, Dr. Lee has always had an interest in space exploration. As an adult, he turned his interest into a career researching the effects of space microgravity on muscles and the heart. Dr. Lee has been funded by NASA and the NIH and has had experiments on numerous space missions, including the space shuttle, the International Space Station (ISS), and suborbital flight. Dr. Lee’s most recent experiment in March of 2020 involved sending bio-engineered heart tissue to the ISS for one month to study the effect of space flight on the heart with the goal of using the results to help patients with heart disease on Earth. Dr. Lee is also a U.S. Air Force Lt. Col., where he serves as a surgeon and flight surgeon in the Air National Guard.